Actually, Opera does look much more like a native Windows application. At least if you are using a recent version of Windows. Get with the program, and get Windows 7. XP is dead.

I'm using Vista, and I'll stick with a nice and simple look for my desktop. I don't need so many useless special effects and distractions in my UI, thanks.

Maybe a fancier looking Opera does fit the look of Windows 7, but Opera 10.5 definitely doesn't feel like a Windows app. Even with the default non-standard skin used in 10.10, it still felt more like a native Windows app than 10.5 does. This is more about feel and use than aesthetics.

Previous versions used standard MDI window management, with all the features and consistency that offered. Opera 10.5 replaces that with a non-standard in-house UI that feels very different in its current version.

I wouldn't mind if it offered significant advantages, but at the moment 10.5's window management is far more problematic and less functional than it was in 10.10.

As for betas being feature complete, you are wrong indeed.

I'm talking about previous Opera betas, not betas in general. In the past most Opera betas were feature complete, with bug fixes and minor tweaks often the only changes in the final release. They certainly didn't have so many badly broken features and obvious problems.